From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
List of issues and recommended modifications for an S.U. Carburetter.
| Identifier | ExFiles\Box 31\5\ Scan267 | |
| Date | 10th December 1934 guessed | |
| S.U.CARBURETTER. (1) CARBURETTER CASTINGS. - These require cleaning up to avoid the pockets and cavities between flanges. Stud bosses could be closer in to centre. (2) INTAKE DRAIN. - Arrange to drain orifice to be at the lowest part of intake when bolted nose up 15° (3) INTAKE FLANGES. - These should conform with existing Kestrel Vl.{V. Lewis / Mr Valentine} intake dimensions. (4) LONG STUDS. - Use long reach nuts to facilitate removal of carburetter when in a machine. (5) SANDWICH PIECE BETWEEN FLOAT CHAMBER & SUPERCHARGER. Could this be integral?. (6) AIR BALANCE. Carburetter appears to be susceptible to air flow variations. Source of air supply to diffusers and float chamber should originate from screened jacket. (7) FLOAT MECHANISM. Float mechanism sticks and causes flooding. Requires stiffening up generally. Float is loose on the toggle arm. (8) ACCELERATOR PUMP. (a) Air release orifice into float chamber (atpresent external). (b) Resistance too great when accelerating quickly and pump acts as a dashpot. (c) Delivers fuel on slightest throttle movement. (9) FUEL SUPPLY FOR AEROBATING. Jet orifices are at lowest position of float bowl and possesses no fuel capacity for slightest form of aerobatics. Would probably dry up on a power dive. (10) RICHENING ANEROID. Should be arranged to avoid excessive movement at small throttle openings to prevent straining the aneroid. (11) RICHENING NEEDLE. To be arranged to be at rest except when required to | ||